Add Local Storage (EXT/LVM/XFS) in New SR Wizard

[michael-manley]

In the SR Wizard, add a way to create a Local Storage device (aka EXT4/LVM/XFS) device.

Although ZFS is supported, I won't be adding it to that prompt due to it requiring manual intervention. If there will be a way to automate using XAPI, then I may revisit this.

[michael-manley]

Ok, I added just enough so it creates either an EXT, LVM or XFS store. The help isn't there yet and is just a stub.

I think there should be a way to query what disks are on the system and get the proper /dev/disk paths so you don't have to manually type it in.

Also on selecting XFS will add to the help that you need to make sure xfsprogs is installed on the host otherwise it will fail